You're looking to address both protection and cleaning up the power.  As already noted, a quality surge protector at the main panel is a cost-effective approach for some peace of mind.  Reality is nothing can protect from a direct strike but for the majority of issues this is great protection.

Especially since you can't run a dedicated line I would consider models that "regenerate" the power.  I had the Furman 20i Reference already mentioned and now have both a PS Audio P15 and P20.  Recommend both brands.  In my case for both SS and tube mono amps I preferred plugging them into wall with the Furman.  With the PS Audio units I have not been able to hear a difference and like the additional level of protection.  I expect having enough headroom in the conditioner(s) is key.

I too live in Florida and I don’t understand the need for a basement to install a dedicated line. Mine runs through the attic. For protection, you need to consider a three prong approach. FPL offers a whole house surge protection that they install on your meter. It’s not expensive. When a power surge damaged my amp, they reimbursed me the full price I paid for it new although it was over 4 years old. As for power conditioners, your choice is unlimited I use Synergistic Research and have no complaints about it. At the fuse box, I used Eaton CHSPT2ULTRA Ultimate Surge Protection 3rd Edition. Amazon carries it..  Good luck. 

This comes up about once a month so I wrote several blog posts about it:

https://speakermakersjourney.blogspot.com/2023/10/time-for-new-surge-suppression.html

The AQ  niagra 3000, or 5000 is very good and has a large capacitor to give it power factor correction as well as line conditioning ,and all outlets are gold copper 

not cheap brass like Hubble ,copper is 3 x the conductivity,which = this is lower noise floor Anthony at Perrotta consultants gives from competitive pricing and maybe free shipping 

Small, features, protection, reserves

Prestige Series P-1800 PF R 

https://furmanpower.com/products/p-1800-pfr

they are usually on sale somewhere, do a search

I picked it based on this feature:

"Power Factor Technology, which provides a 45A peak current reservoir"