The Spot is bolted in the nose of the glider forward of the rudder pedals..

So, with the Spot locator bolted in front of the rudder pedals, you don't have access to the SOS button. And if you have to "go for help," the SAR folks will start looking at your tracking information, which could be ~10 minutes old from the last updated position (unless the Spot survives the impact and continues to update). And then they will find the glider location. Hopefully, you will be close enough after bailout, chute deployment and descent to wave at them. But probably not. The Spot or InReach should be on YOU, not the aircraft.

Oh, BTW, carry the InReach instructions with you. Hate to make a safe landing (with or without glider) and not be able to remember how to send a text message.