Was thinking more about this,
Since there are 7 columns and 3 rows, the classic V formation exposes the tank to 3 columns with the remaining 4 heroes each exposed to 1 column each, AND with each hero only touches two neighboring heroes, the only valid other layout is the INVERTED V.
The inverted V follows all the rules of the original layout (all heroes exposed to at least one column, and each hero has only two neighboring heroes) with the notable difference of instead of a ‘tank’ exposed to 3 columns, there are two front heroes each exposed to two columns, and the remaining three heroes exposed to one column each.
Since it follows all the same rules, it is already ‘balanced’ and yet it is different enough that it is a totally new stategy of two mini tanks or one main tank. It would be an excellent addition to the game! @EmpiresPuzzles, @Petri