If it were my tank, I wouldn't set it up until it was drilled with an internal overflow installed. You can always put plugs in the holes until you are ready to get the sump hooked up. It is risky to drill it when there is water in it, and difficult to impossible (depending on what type you want) to install an internal overflow. It really takes a lot of work to drill a tank after it has been set up. Those hang on siphon overflows are horrible, so I wouldn't even consider one of those.
If drilling it now isn't an option, I would go skimmerless until the tank gets drilled. I would also run it bare bottom and be sure to not overstock fish until the skimmer and sump are installed. Of course weekly 10-25% water changes will make a big difference too.
Imo, the Remoras aren't worth the cost for tossing them in the trash. I have owned a Remora and a Remora Pro and really think they are quite a waste of money. Imo, those people who think Remoras are good skimmers, have never had a
better skimmer to compare to. Sure, they are a better skimmer than a BakPak or a SeaClone, but that doesn't take much!
Imo, the only HOB skimmer worth spending money on is a Deltec.