Upgrade path

Significant Upgrades:

Upgrade 1: Subwoofer

Upgrade 2:

Since you have a ’long’ room....

Run the preout from your Naim to a fosi audio za3 amp (or some cheap amp with a volume control) and connect it to a 2nd pair of speakers. Set the 2nd pair of speakers behind your listening position, i.e., analog 4 channel stereo

https://www.youtube.com/watch?v=_MO3kmCzKsI

(You can find several guides on this channel.)

You will have a better listening experience than the guys sitting around with their same old 1 goofy pair of speakers, swapping cables all day long.

As others have said. Run in and listen to what you have. For that size room, you may discover the Naim is short-changing your speakers and that your next upgrade is to provide it with more suitable amplification. I'm not saying there is anything inherently wrong with your choices, just that you really want to get this pairing right before thinking of other upgrades. 

ascertain what you have now and for the rest of your life

you can use test tones and an inexpensive SPL mic and make a chart and measure what you are getting, the results of any alternate positioning and/or toe-in, and future changes.

this CD has 29 1/3 octave test tones

https://www.discogs.com/release/7290000-Various-Amazing-Bytes?srsltid=AfmBOooCbmdDtJiwxtnjyZg7fpWqsu2yEAcDB8vBhwNwSKljSIYIVUdv

I could help you find an inexpensive copy

and, you do not need professionally calibrated mic, just measure spl, each realative to the other, it needs a hole for tripod mount, set at seated ear height in your listening position

https://www.amazon.com/Decibel-Mengshen-Measurement-30-130dB-Included/dp/B01CZFCRA8/ref=sr_1_12_sspa?crid=BUDL9QCNIYLI&dib=eyJ2IjoiMSJ9.phgj0S1FMI2tb2XMRTwtyFsUra_pKZ-DrgHet-4fZw2gjP2Acng2wdDlE8DeP3mfBr8PHolP0iJop9dajbKtD_02b5Ey43fdj1WkpqfYolh0yCoZfR_Wvm2OhBNPIXQ2aTvwKUdVJ_BBk5sIfOjxejflfefHnF9QksvxAPuU1hahaH5WA_1VIGH0sb04tHt0cG6llR2mAq6-7suYa8JIlu0rML5z7tCl67TMEPluS0g.5YoclwGlGqxeTj79cFiDOVIbTLwJBdhDufbzoymA21c&dib_tag=se&keywords=spl+meter+tripod+mount&qid=1760721367&sprefix=spl+meter+tripod+mount%2Caps%2C84&sr=8-12-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9tdGY&psc=1

I cannot really answer your question directly, but, note: The best advice I heard when building a Stereo system is "Start with the equipment closest to the ear and work backwards".   So, this means to pick the speakers first (including if you are going with subs, or towers, or both), then pick the amp(s), then the pre-amp, then the sources - digital or analog.  Of course most people pick the amp(s) and pre-amp together.  The same thing regarding cables...  Start with speaker cables, then pre-amp cables, etc....  Of course it is best if you could buy everything at once and hear it all together, but, most of us cannot, so, this is a good rule to follow.  One good logic for following this plan is that all the components will match the speakers you bought because it is the first thing you picked, and the sound should get progressively better as you upgrade since you liked the sound of your speakers from the beginning.  Another point is that amp to speaker matching is critical as you dial up the volume.  So, check current requirements at specific ohms for the speakers and make sure your amp(s) are up the the task.  Of course, this also means that you should spend the most time picking your speakers and how they will sound in the room they will be installed.  Speakers have the most effect regarding the sound of the stereo system. 

You got some nice gear. Would not invest in anything new, until you have your current setup sorted out. What does that mean?

1. Speaker placement

2. Speaker placement

3. Speaker placement.

4. Sorting out placement of all the other gear

5. Power, how and where it all plugs in, sorting power from signal cords

6. power conditioner? 

7. Rabbit hole of what cable works best

8. Should I get a deadicated line?

9. Back to speaker placement...

10. room treatments

What I'm saying if your gear is setup wrong or in the wrong place, it doesn't matter how good it is, you will not be hearing it. Speaker placement is #1, other things will fall into place. But as things change, you will revisit, the list over and over. 

It's a lonely hobby and not everyone will get it.