So why not put turrets around the base itself and not around the jump-hole, if GRN came in the system I guess their prime target would be that base. So really the turrets are better positioned around it to cover all angles, otherwise GRN could come in from other end via Rouslin and avoid that JH, then target the zoner base from back end with it's turrets further away from them than the base itself is to shoot. So it doesn't make sense to put the base turrets around the JH, other than to kill anything that comes through it in 2 seconds flat. But there's more than one way GRN can enter Baffin.
Not much thought was given to that base location, apart from putting it their to make it easier to drop commodities off the base needs from Kasari. They should have plonked the base further away from the Tau-29 JH, so then at least regular players could still use it as normal without getting blown to bits. Why didn't they put the base near the Zoner Guard NPC one in Baffin, so that would have given it some added extra protection with it's own base turrets.
Looks to me like the only reason they put it near that Tau-29 JH, is to make is easier to drop Basic Alloy off brought in from Kasari once you jump from Tau-29 into Baffin.