Isolateit does make a sorbothane product that is coated and not supposed to interact with wood finish. I was going to try them for my Phil 3 Uppers, when I found out that Jim went ahead and included the regular sorbothane feet. I talked to a guy with Isoalteit and he said this option is less grippy because of the coating. If you want to make certain something is going to stay in place, you have to decide between the possible damage the plasticizer may do to any finished surface you put them on. I was told that the adhesive backing is easily removable with little to no concern of damage from the adhesive (again from Isolateit).
I'll try to get a photo up of the sorbothane "imprint" on the top of my lower cabinet. Its not bad, and as Dennis and Jim pointed out, you'll only ever see it if you separate the cabinets for moving them...
7.2: Marantz SR6012, Outlaw Model 2200 (L/C/R/SL/SR)
Philharmonic Phil 3 (L//R), BMR (C), BMR (SL/SR), Mini-Phil (RL/RR), Outlaw X-13
Sony XBR49X900F, Sony UBPX700