Stirstarter, good product, good price, great service.
The only thing i don't like is having to carefully balance my 5L flasks, but it works like a charm.
Build yourself a stand for your 5L flasks - something that is the same height as the top of the stirplate but with a hole in the middle that you can put the stirplate in. A little bit of plywood and some scrap 2x4 should be all you need. It will support the edges of the flasks and not interfere with the stirplate.