My previous amp stand was a concrete patio block 18" x 18" by 2" on old Top Toes cones into the carpet on wood floor. It worked OK.
Then I started on butcher blocks..
I noe have my amplifier up on top of:
Base is Maple butcher block 3' thick 19" by 18" up on those same Tip Toes.
On top of that is a Walnut Butcher block 3" thick 17" by 14" aligned to allow open air access for the cooling fins from below The Walnut has very small flat Ebony widgets in a trapazoid pattern wide front narrow rear between the blocks.
On top of that pair of butcher blocks: Rear is a 2" by 2" by 12: long Verawood spindle (unfinished) in front is a pair of 2" tall by 4" by 4" bowl blanks (unfinished) of Bolivian Rosewood. (I had tried a variety of different size thickness and kind of exotic woods)
The amp OEM feet are directly to the exotic wood.
This arrangement was carefully arrived at by listening.
No one should blindly just copy this. Rather find the right stuff for your own best sound. Cheers.