Yes, I thought that you wanted wi-fi coverage “around” the field, but your last scheme is clear, and of course you can play a little with the orientation of the wAP ax’s.
Generally speaking the more wide is the radiation angle from antennas the more the output power is “dispersed”, so having devices that cover narrower angles should provide better signal (in the covered areas).
The wap AX has a pattern (see here):
that you seem like having well represented in your sketch.
The “wireless wire” link between the “wide” Cube pro SA (if I remember correctly, but needs to be checked, it has a 60° angle) and the “narrow” Cube Pro’s (11°) should be good for up to 500-600 m, your case is more like 300-400 m, so it should be fine, and (again it should be re-checked) a Cube Pro SA should be able to “feed” up to 8 devices.
BUT personally I would think of using two of them because of the bandwidth.
Having two Cube Pro SA’s, each feeding 3 or 4 Cube Pro’s seems to me more reasonable.
A litlle word of warning, there have been reports of issues with weatherproofing with Cube Pro’s, incorrect distribution of liquid gasket, though it probably depends on production batches, see:
Again, personally, I would add an external additional caulking with good sealant before installation, better be safe than sorry.
I would try using a geotextile tape and some liquid rubber around the whole device, at least here it is available also in a light grey colour (besides black and red) that shouldn’t be too noticeable.