I tore my meniscus and ruptured my ACL back in Oct and got surgery in Nov. I logged the entire recovery process post op. You might find it useful to come up with some ideas on how to train
As for your question on grippers, I used them a lot, and a good idea is to get 2; light and heavy. This will allow you a LOT of variety vs just 1. You can do dropsets, where you go for max reps with the heavy, and then chase it with the light. You can do timed holds with the heavy one. You can pre-exhaust with the light and then go for the heavy, etc.
For most trainees new to grippers, I suggest the trainer and the 1 from Captains of Crush.
EDIT: Oh yeah, and if you want this to carryover to holding onto weight, focus more of your energy on timed holds. Just closing the gripper builds crushing strength, but that doesn't really have a lot of carryover to holding weight.