Center speaker and AVR on same surface?

+1 @erik_squires You might try these under the center speaker that may reduce resonances and improve clarity, and they’re even adjustable for weight and sound. They’re only $23 for four, and if they don’t produce a meaningful improvement you can just return them.  A lot of people here swear by using springs under audio equipment so probably at least worth a try for curiosity sake if nothing else. 

https://www.amazon.com/Tertullus-Isolation-43mm%C3%9738-5mm-Aluminum-Turntable/dp/B09QC1DJXT/ref=sr_1_6?crid=3O9WPNIK3HIXK&amp=undefined&keywords=speaker%2Bisolation%2Bpad%2Bspring&qid=1680557813&s=electronics&sprefix=speaker%2Bisolation%2Bpad%2Bspring%2Celectronics%2C143&sr=1-6&th=1

So to add to this, I use the isoacoustics stands, and have had the opportunity to do some measurements on my center channel speaker, so I’m not just talking randomly here.

While some issues about resonance are due to mechanical coupling, some are due to the boundary effect of any speaker on a shelf with kind of random dimensions.

Both are worth taking care of.

Also, depending on your needs, the IsoAcoustics pucks may be better.

Really not sure if vibration will effect a solid state unit.

If it were tubes then I would be concern.