Only two hives Dee? 
There are plenty of discussions regarding placement with some great advice, here’s one.
http://forum.honeyflow.com/t/where-to-locate-the-bee-hive/229
We’re on a 3/4 acre block with a pool and have currently 5 hives with 2 known tree colonys on the block also. We do get too many bees in the pool and do get followed around when swimming on a hot day. Not agressively, they are just thirsty and see wet bods as a safe drinking spot. We rarely get stung though.
We have 3 young children and they are aware of the bees and enjoy them too.
Ideally south facing (northern hemisphere), full sun.
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