I use this for about a year now for my mouse and am happy with it. https://www.amazon.com/-/de/dp/B007EKER44/ref=mp_s_a_1_3?dchild=1&keywords=speedlink+lax+wrist+rest+gel+pad&qid=1606601055&sr=8-3
I think it is near your stated thickness. It is not too soft and does not reduce much in hight when laying my hand on it.
The bottom has some non-slippery material so it stays where you put it.