When I had a 60 gallon tank with pretty much the same footprint as 75 gallon tank I could not keep multiple pairs of clowns. A Wyoming White (Ocellaris) pair was the only one in it. Best bet is to buy a nano tank in addition to your 75 as a home for the second pair of clowns.
It won't work. The territory can extents more than 1 meter (3ft) around the anemone - and that's out in the wild where a lot of hostiles are around and no other anemone in sight.
You will end up with one pair dead.
If you want to keep multiple pairs go with multiple smaller tanks. In a connected system 10 gallon is enough for a pair of percula or ocellaris.
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