Regarding the K&M stand Rubber Question:
I use the K&M Omega Stand 18810 combination with Stacker 18813. I have my new Genos on the top tier and my 88 key Kronos on the bottom. Both the cross braces on the stand, and the stacker arms have rubber protectors for the bottom of your keyboards but they do not appear in photographs. The K&M rubber protective pads come on a sheet like stickers and you stick them on yourself to fit the profile of your keyboard base. Most keyboards have some cutouts in the base so you want the rubber pads to be affixed to the part that touches solid parts of the keyboard base. I like the K&M Stacker because, when I play sitting, I can tilt the top tier down and easily play both boards at the same time. When I play just the Genos, I adjust the top tier flat/horizontal and play just that one board standing up. Besides looking more dynamic, an extra benefit of standing, while playing, is it burns about an extra 120 calories, per hour. K&M is usually available during the 15% off holiday sales. A couple of caveats if you’re considering the dual stand setup This particular one is a separate-pieces/re-assemble-with knobs knock down type setup. So, if you want an instant folding flat and pop-up stand for frequent gigging, this may not be for you. While the bottom main stand is extremely stable, once you add the stackers to standing height, there is some slight wobble forward and backward if you are pounding the keys for a hard rock song. Also, wobble, for any stand, will be exacerbated when it is placed on a carpet versus solid floor. Because I am extremely sensitive to even the slightest wobble, and my home studio is thickly carpeted and padded, I added my extra OnStage X-brace stand to the lower setup to make everything even more rock solid - enough to play a Jerry Lee Lewis song with your feet
Hal