I have experience of two different kinds aerotowing from a CG hook:

1. Launching an LS4 (tailskid) from an unmade (dirt, gravel, rocks) runway.
The problem here was directional control, with the glider snaking around
until there was enough speed for the rudder to counter the crosswind. Not a
real problem but hard work for 2 or 3 seconds. Hand on release in case the
direction of tug and glider get too far apart.

2. Launching my Open Cirrus (tailwheel) from a paved runway. Absolutely no
directional control problems at all. By the time the tailwheel is lifting,
the rudder is working. Just be aware of the possibility of swinging once the
tail comes up - whether there's any swing will probably vary between glider
types, but I've never noticed anything with the Cirrus.

There is, for all CG hook aerotows, the danger that if the glider gets high
it will begin to winch launch itself. I'm told this will pull the tug tail
up and cause more excitement than anyone wants (or worse than excitement if
low down). Neither the LS4 nor the Cirrus showed any signs of doing so, but
I kept a watch on the tug position ready to release if it got away from me.