You would definitely want a subwoofer with any remotely affordable Magnepan. The LRS, LRS, being the smallest is no exception.
Maggies are great speakers. I’m on my 3rd set. In any price range thet are stand-outs.
But... you’ll need a good high-current amp and lots of space. They want to be 3-5 feet from the wall and they can be very tricky to get positioned correctly.
If you have the room, the watts & amps and the patience, they’ll reward you.
They are very "fast", accurate and musical so don’t pair them with some slow, boomy subwoofer. Get a fast, accurate sub, like a REL.
The LRS comes with the cheapest, worst stands. If you look at all Magnepans above the LRS, you’ll notice that they all stand upright...not tilted back 15° like the LRS. There’s a reason for that. There are a few companies that make excellent after-market stands that will hold the LRS closer to vertical. "MyStands" is one such manufacturer.
I downsized and have a room that is technically too small for my Magnepan 1.7’s. With some room treatments they still sound incredible and are making it very difficult to get smaller speakers. I’ve tested some Keff and B&Ws. They sounded very nice, until I went back to the Maggies and heard everything that was missing from the others.
Enjoy your journey!