Fran, if you are suffering pedal 'creep', can I suggest you stick a couple of the 'hook' parts of a 'Heavy Duty Velcro' (the kind where BOTH sides are hard plastic) strip on the underside of the FC-7... That's carpet taken care of.

Then, that plastic, semi-sticky 'shelf liner' material you can buy in rolls from any kitchen store to stop your utensils from rolling about or to hold plates from sliding, this stuff works VERY well on a variety of hard surfaces, from linoleum to tile to brick. You can either cut a piece to the same size as the FC-7, or carry a roll big enough to put under your entire key rig, then NOTHING creeps around much.

That all plastic Velcro has MANY uses, and if you prepare the surface before sticking it on (a little solvent or detergent to get rid of ALL dirt and grease) is capable of incredible strength, if needed. I used to be able to pick up a fairly heavy WS by the little drum machine velcroed to its top, back in the day. That stuff is amazing!