C4-c5, c5-c6 total disc replacement using 2 mobic-c. Will mobile device get dislodged or crack? Will it cause paralysis/ nerve damage if this happens?

Mobi-C. This is a relatively brand new device, and it is the first and only artificial disc on the market approved for two-level surgery. The data from the company shows good results. Realize, however, that the mechanism of stabilization for this device is very different from others that have been on the market a lot longer.
Need to ask this. Type of question from your surgeon before the surgery. Now still need to ask the surgeon this question if it as bothering you.
Not likely. Lots of testing has been done on these devices they are designed to withstand high forces, it they are placed properly the risk is low.