Basically you have two options:
1. Get a TV with a cable card slot and lease the FiOS cable card from Verizon to get all your channels. The cable card obviously would fit inside the tv and therefore does not require any external set top box.
2. Lease a standard set top box or the smaller digital converter (DCT-700), and hide it in a nearby cabinet. Obviously you'll need to run a cable from the box to the TV and from FiOS to the box. To be able to control the box through a closed cabinet door, you'll need a remote extender like this one:
http://www.amazon.com/Ne...-Extender/dp/B000C1Z0HA/