my tank is in a room with a wood floor, and I occasionally leave for a week or more. Here's a few things I did, that you might consider:
I use a peristaltic pump, not so much for it's ability to pump far, but because it pumps slowly - at 7GPD, it will take a while before there is a problem
My ATO reservoir is smaller than my available space in my sump - I could have a problem if it all pumped over AND there was a power outage, but in general, it can't overfill. Since I use a lid and don't have powerful lighting, I only evaporate about 5gallons per week from my 110, so a 3 gallon reservoir is not a problem.
When I travel, I set up a larger container, like a tub, and just use push on connectors to extend the tubing from the normal container
I have a float as a back up shut off, but since a peristaltic pump is positive displacement, that means I run a recirc line back to the ATO container with a vent to the DT. IF the float switch closes, the water just goes back to the ATO reservoir.
My peristaltic pump is mounted over the ATO reservoir, so if the tubing popped off or developed a leak, it would leak back into the ATO reservoir
My ATO reservoir (I think its a square bird seed bucket) is in a small plywood "tub" I built quickly out of scrap so that it will fit hidden in my available space which is not under my tank, but provides some protection if the ATO reservoir leaks or drips.
I think I must have thought about my ATO more than my return pump!