Given BKC's Platoon scale I'd still look to amalgamate the stands somewhat - Wiki & the battery website reckon one Flak-20, four casemates with one 100mm gun each, and 12-15 other firing positions with MMGs.
From the aerial photo I'd do one "combined bunker" for the guns - even if you had separate gun models/model bunkers treat them as a single stand.
Looks like the trenches & MG positions are then in a 360 degree arc with some pointing over the top of the gun casemates.
I'd do three MG stands, each in a "cluster" of trenches/MG bunkers to cover that.
I like the approach Timecast have taken with their trenches -
http://www.timecastmodels.co.uk/range_13/range_... Three of those arranged in a back to back circle, one slightly elevated with the four gun bunkers forward of it, then surround with mini-barbed wire and you're done nicely!
The whole position was at250 yards across, so it might even then fit on a single CD as a scenic base?!