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See attached image:

Question: If you wrap termagaunts around your tyrant brood, will it give cover saves to both units?

Units:
Swarmlord, 2 Tyrant Guard, Tyranid prime
Large blob of ~20 termagaunts

Reasoning:
Firing at Swarmlord's unit - From the picture as you can see, the majority of the swarmlords unit (2 Tyrant guard and the tyranid prime) have intervening infantry (gaunts). Since the majority of the swarmlord's unit is in cover, the unit is granted a cover save.

Firing at the gaunts - From the picture, at least half the gaunts have intervening units (tyrant guard, swarmlord) that partially or fully block line of sight to the gaunt brood. This would grant the termagaunts a cover save too.

Is this setup allowed? Would adding more termagaunts behind the swarmlord make it legal?

Check BRB FAQs before positng, is the general rule.

This is a variation on the checkerboard pattern. In this instance the gaunts, as the closest of the two units, would not get cover.

The tyrant guard unit, would gain a cover save due to intervening units. The hormagants, however, would not. See WH40K FAQ.