skimmers

[fishguyxd]

I am looking at the asm skimmers(insump) but never used one I have heard the work well but not sure ,where do i have to place it in the sump, near the drain pipe or middle ? could it go there ( I don't have a super amount of room in the sump drain area, What type of skimmer is it ( venturi,etc) and how do you set it up? looking for info please.