How high can you pile stuff under the seat without ******* something up?

Just installed a Custom Dynamics Triple Play module. Goes under seat. But cannot find a place to put it, unless I go up.

EDIT: Ok I got it.

 

its a 2 fold answer

If you have a seat with a flexible base, make sure the seat doesnt rest on the box when under weight

If you have a non-flexi base as long as you can bolt the seat down with out jamming it..

Make sure no exposed wiring is happening