I added a AGM battery bank for my residential refer install... two of the four are on their sides.
This post is my opinion (free advice). It is not intended to influence anyone's judgment nor do I advocate anyone do what I propose. Sold 04 Dynasty to our son after 14 great years. Upgraded with a 08 HR Navigator 45โ...
Peggy's scooter, a Honda Silverwing 600cc twin, has the battery mounted horizontally with the terminals sticking out sideways. Never has been an issue with it.
Previous DP had a weird battery configuration. I used two AGM mounted on their sides, and wired in parallel for starting batteries. Several years and no issues.
Several devices, UPS units for example.. My "Luggable" jump start pack, all use AGM batteries for just that reason.
Home was where I park it. but alas the. 2005 Damon Intruder 377 Alas declared a total loss after a semi "nicked" it. Still have the radios Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times