Can't help with the interior bike holder question but would be interested in that too.

Haven't seen any mats as long as what you're asking about. I suggest that you buy a piece of "rubber sheeting" which comes on a roll that you can get at Home Depot-type stores. I bought a piece, with ridges, for another SUV and cut it to fit. It was easily wide enough. It worked well in that SUV. I think that I'll do this for my X5 too...

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2008 X5 4.8i | Wheels: Summer> style 336 20" RFT; Winter> style 214 Ferric Grey 20" RFT | Aero kit | ESS E-Flash tune | V1 | LCI Rear Tail Lights | Coding completed | Engine replaced at 90K