I thought a mini LED clock would be a good idea so I ordered one off ebay. Mounted it in a small piece of thin plywood on top of the kitchen upper cabinet. Looks great, acts as a night light and won't ever move! :) Loses several minutes a month and needs resetting from time to time over the camping season. :M Oh well, I tried (sigh)...
Mounting method may depend on the actual clock, size/weight and location in your TT. Have a photo of front & back?