I'm pretty sure the spikes would work their way through just about anything underneath that wasn't really hard. I just cleaned the floor really well underneath and the bottom of the feet, hopefully it'll be enough to keep it away from the wall for more than a movie viewing until I find a solution. I'm thinking something like industrial-strength double-sided tape under the feet, as long as it doesn't have oils or dyes that'll mark the floor. I remember having some stuff holding the rim of a truckbed liner to the bed a long time ago that from memory would be perfect (thick rubber stuff, sort of like wide and stiff rope caulk) but I haven't found anything like that yet.

I hadn't noticed this was such a big problem with my friend's borrowed Signature, probably because I was moving it around a lot.