For safety and convenience, pass on the electric starters that have cords. They are tied to your flight box by that cord. That cord is a hazard that winds up in spinning props every so often, with predictably bad results. The battery in the flight box makes that box a pain to handle. The "portable" starters are safer and can be carried anywhere. They're good for restarting models that shut off while taxiing etc.

Also for safety and convenience, same deal with the glow plug ingiter. Cordless.

Get rid of the cords to both tools. Flight boxes with two cords, one for glowplug one for starter, are accidents about to happen. You can't use both tools at once without one cord having to pass around the prop fan.

No cords: lots less risk, massively more convenience.