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I run (or will run, when they're built) an OK army with the typical Tenderizing Tyrant and +3 Shamans. I also run three squads of four-man Ironguts with standards/bellowers. One of these gets the War Banner for that added CR.
The initial plan had been to plop the Tyrant in one of these squads and run it four wide, with the extra RnF Irongut giving the Tyrant a S6 Bull Rush. Two of the butchers would tag-team the War Banner unit (one with the Skull Mantle, because two potential Braingobblas at the -1 sounds interesting), and the third butcher (who uses a Siege Breaker) would ride solo in the last Ironguts unit.
Doing the math, I initially thought that I would need a frontage of four models to make this effective. On further review, with that frontage at least one Irongut in each squad is going to be twiddling his large thumbs at the back.
The question, therefore, is this:
Is it better to have three squads of ironguts with a frontage of four, or four squads with a frontage of three? If the latter, is it worth expanding the frontage to four when adding a hero and keeping the unit in a single rank, or putting the Mus/Std/Hero in the front rank with the RnF Ogre at the back?
Thanks for helping shed some light on this!

I'll have to say, you'd probably be better of with (more) units of 3. Altough your "heavy hitter" units having 4 rank-and-file ogres isn't bad either. Normally you'd better keeping the ogres off from back ranks as you want all of them fighting, altough if some weird situation arises where you can put guys on the back and still have maximum combatants, go for it.

Anyone meant for combat (the ironguts) needs the 4 models. Two ogers is 80mm, most units out there are 5 wide which is 100mm. so all 4 get to fight.
PS. plan to have 4 in there after your char joins or you will have a guy twidiling his thumbs.

If they are just there to flee then 3 is fine.