Well I tried to fit six standard shallows however it was a bit tightened and importantly the lower support seems to be designed for probably langstroth frames so did not properly hold them at all. I ended up just doing three at a time with a cable tie holding the frame upright by one of the lugs - I actually used two different coloured ties set to one side of the centre of the cage side so when I turned the frame I didn't get in a muddle
added - as you only have a few hives I would suggest you look at the Saf Natura range of small extractors, made in italy and sold through easipet and other eBay and amazon distributers.