To put it delicately: Those wheels are gonna be broken in 2 by match 3.

Mecanums have no traction, and worse, are very fragile. Most teams will be going full speed to get over those ramps, and if you do that with mecanums, then they'll get broken before they become useful. Not to mention, it'll be hard to get any traction on the bridges.

If you do use mecanums, then be careful, use them the grippiest way possible, and double check your choice.