You may bolt controller to the back of the panel like they do in $350 Renogy "solar suitcase" (same 100W, only made of 2*50W). Included #10 tray cable for battery is a bit thin, but 8ft length isn't too long, at this low current.
When you tilt panel up to the South, controller is TAD covered. Renogy use regular low-end PWM controllers on those suitcases, I don't think they are water-proof or even weather-resistant.
The kit you're considering is for roof install, that's why it has (useless to you) brackets and no after-controller fuse, as this fuse is installed by user and is usually a breaker or re-setting fuse. In this application you may skip the fuse btw the panel and controller, but you should have a switch or some sort of disconnect btw controller and panel because controller should NOT remain connected to panel when it's not connected to battery.
1A fan in the fridge will likely add 8-12 AH a day to regular fridge circuit draw, so the total fridge+fan will draw 20-30 AH, and 100W panel will barely harvest that much. The length of your stay will depend on how much other loads you use.