@jrcotner I'm also an owner and purchased a Rogers KWM-88 two and a half years ago and I absolutely love it! Coincidentally, I also replaced a Prima Luna Dialogue, which I still have. I'm pushing a pair Focal Sopra 2s and the results are absolutely amazing!! I get the best of both worlds, power and dynamics and holographic imaging and deep soundstage. This will improve your SQ substantially and then your focus will be on improving your source and other components.
I've been running the same two pair of KT88 and KT150s and I'm sure the 150s must have 3000 hrs and still going strong. Yes, I listen a lot, mostly because I can't pull myself away until the wee hours.
I think your placement of the amp should be fine, the same as any other tube amp. It may run slightly warmer but not to the point of requiring anything special.
You've received a lot of great information on this post from some of the best minds in the business but at the end of the day, we typically have one amp/system and we want that system to be engaging (when it all comes together).
Finally, as @wsrrsw mentioned, Rogers provides great support if ever needed. His amps really are built like a tank and will last generations. If you haven't already, check out some of his videos you'll get an idea of the quality, engineering and extensive testing he puts into his product.
Good luck on your decision and enjoy the music.