Hob overflow kit

Im looking for opinions on a good hob overflow kit for a 20g tank. I know it'd be better to drill the tank bit I already have it set up and no where to keep my sand/rock alive long enough to get the tank drilled,plumbed and sump made. I plan to just use a 5.5g I have to make a sump/fuge. Basically I want to try and have a nano tank with everything it could possibly need to maintain a healthy tank with low maintenance. I appreciate any advice. Thanks

Kevin