i have the HOB1 and was also concerned about overflowing the skimmer but there is a tube that will overflow back to the tank, if there is an issue. Yes- thats not the best but it does protect you from a water nightmare.
Now if you have a sump, then I would go with an in sump skimmer. but the 45rl doesnt so i would assume you will have inside your tank? If that is the case, I would go with the HOB1.