IANAL, but have done a few of these type projects. With some caveats of course, as long as you are using FCC licensed tablets (e.g. must have an FCC ID already

IANAL, but have done a few of these type projects. With some caveats of course, as long as you are using FCC licensed tablets (e.g. must have an FCC ID already) and are not modifying the radio or antenna then you just have to list the FCC ID of the original tablet on the outside of your packaging and follow the rules for manuals etc. This is similar to why a lot of people start with FCC licensed modules for hardware projects instead of building up their own. Also, if you co-locate any other transceiver then you will have to do FCC testing and get a new ID, although it is not that difficult or expensive to do it generally. I had built a few kiosk marketing solutions that basically did just this and we did go through legal just to make sure we were on the up and up and it was really simple. Honestly just following some instructions from the FCC would have been good enough, but we didn't want to chance a screw up.