I do them at home by putting a bench on top of a couple of boxes. These boxes should be high enough that your feet don't hit the ground. Lie down on the bench in the reverse hyper position and hyper away! For extra weight, I strap weight between my ankles with an ordinary jean's belt. You hmay have to put a counter weight on the front of the bench, otherwise it may tip.
I currently use this with 50kgs strapped between my legs for 4 sets of 10. It's not as good as a reverse hyper machine, but it will do until I can get one.
If you have a power rack, either mindeffer01 or mertdawg have a set up that is better than mine. PM them for details.