Been doing a little bit of further research on this and noticed a similar post here on the forum. This cup holder mount looks promising:
http://www.amazon.com/Universal-Adju...AA8Y9N4M4V968Q
Along with this suction cup mount.
http://www.amazon.com/iOttie-Holder-..._cd_ql_qh_dp_t
I like the ability to extend the mount an additional 2" but it does seem like it sits a little but more forward than some other mounts, which could be a concern near the sifter and console buttons. Regardless, didn't know if others have used these two in combination in the M4 yet.