Hey yall, just had a few questions about whats possible in my truck. It is a 2020 Nissan Frontier crew cab. I am looking to utilize the storage spaces under my rear seat while keeping my seats functional. Wanting one box but wondering is a 10 inch sub the biggest I can fit? Would one or 2 fit? Also would I have to do a shallow mount sub? Looking for the most spl possible with the space I have available....