Skimmer in sump?

[traco]

I ordered my Lifereef overflow today for my 55, so in a week, it should be here, yay! I have a 15 gallon tall for a sump. I currently have a Deltec 300 HOB. Looking at in sump protein skimmers as I wonder if the Deltec HOB can go in sump? What is an easy "plug in, no fiddling" in sump skimmer that is not huge $$$? Vertex, Lifereef, Euroreef? Or can my Deltec HOB be used no problem?

Thanks all.