front door speakers tbss

I'm either gonna install these myself, or pay someone to do it. My question is, do I need any kind of mounting bracket for these? Key word is NEED, if I don't need them I don't want them. Will depth (almost 2.5 inches) be an issue? these are some hefty boys and I want them to sound as good as...

What are your thoughts on these for the front doors of the TBSS? Search on Amazon for: Earthquake Sound SWS-6.5X 6.5-inch Shallow Woofer System Subwoofers, 4-Ohm (Pair) Let me know what you think...