I noticed this in the game I just played. As a unit, instead of deploying in a manta, can deploy Via the Low-altitude drop, and the only restriction, is that you can deploy anywhere within 6" of the marker.
Keep in mind, that the marker is automatically destroyed if it's ever within 9" of an enemy unit, so it might be hard to deploy within 1" of an enemy in this instance, as no enemy can be within 9" of the marker, and the deployed unit has to be within 6" of the marker, and the Stealth Suits have to be outside of 12" of the enemy units when they (and their marker) is deployed.
I can see you deploying within 9" of an enemy pretty easily however.
Stealth Suits place Tau Homing Beacons during the movement phase, not during deployment. This means that they can easily just run up to an enemy and slam one down right in front of them. The question is, what happens if you place one within 9 inches of an enemy?
The Homing Beacon, as far as I understand, is not destroyed by an enemy being within 9" of an enemy unit, like a Teleport Homer is. Looking at the Index, the rule is that it is destroyed if an enemy model "ends a move within 9" of it" which is very different than a Teleport Homer, which goes away "if an enemy model is ever within 9" of" it. This means that, by my understanding, you can actually lay down a Tau Homing Beacon within 9" of an enemy, and it will stay there until either it is consumed, or probably during his movement phase when a model "ends a move within 9" of it" at which point it is destroyed.
So, As far as I can tell, you can put a Homing Beacon within 9" of an enemy using your Stealth Suits, then use it, without it being destroyed by proximity, because unlike a Teleport Homer it is not proximity that destroys it, but an enemy model ending a move near it.
This would allow for the situation I am describing.