I used my Labradar for about a year without an external trigger and dropped a few shots. So I bought the external trigger and have not dropped a shot since. I thinks it's a worthwhile accessory. My one complaint about it is that it comes with two velcro dots with adhesive back, and I shoot more than two rifles. When I peeled the velcro dot off one rifle and stuck it to another, it wouldn't stay on the rifle. I'd like to find another way to affix the trigger to the rifle.
I use a regular camera tripod set beside the bench to hold the Labradar. It's a light-duty tripod and works without issues. I set it up so the unit is about 6" to the side and about 2" behind the muzzle.
For batteries, I have been using a set of rechargeable AA batteries. You need to remember to take them out after each session and put them in the charger when you get home, but I have managed to do that without issues. A single battery pack would probably be preferable, but I had the batteries anyway (for a walkie-talkie, I think), so I used them.