These standmount speakers will have a similar footprint as a floorstander...and your room is a decent size.
Do you have a meaty amp and some freedom of placement? If you do, I would suggest the Unifi reference floorstander from Andrew Jones. It can sound quite good without TAD-like prices. It should scale up as the quality of your front-end electronics go up and the rythmik should pair well with it.
https://www.audioadvice.com/products/elac-uni-fi-reference-ufr52-tower-speaker-black

