I have mine mounted inside on the floor of the LP cover. You can mount a marine grade one anywhere outside that suits you. It's just a matter of personal preference/convenience. I mounted my first one on the battery box (lid), but discovered that was sort of inconvenient (in the way) if I needed to access the battery.
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http://tab-rv.vanillaforums.com/discussion/2830/battery-cut-off-switch-installation-help#latest
2021 T@b 320 Boondock "Mattie Ross" | 2021 T@b Nights: 239 | Total nights in a T@b 455 | 2022 Jeep Grand Cherokee L Overland | T@b owner since 2014
Larry & Booger - 2013 T@B, 2012 GMC Sierra
Happy Trails Y'all