Wherever you place them, make sure they span across the beams, ie perpendicular to them, not parallel. That's assuming it's a timber suspended floor? You should be able to get away with a fair ammount tbh, after all, if you can have a few people standing on one of those beams, spanning a tank over several of them is less load.
Try and find out what spacing the joists are at and, if possible, what thickness they are. Is it a timber frame house, or masonry? etc.
A corner won't have much more support tbh, as long as you're spanning in the correct direction.
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