On the tin can I keep an ACR brand EPIRB mounted to the rear helm station, in easy reach on the back deck. It is registered to the boat, floats right side up, and once activated will run for 48 hours +.
I keep a floating ACR ditch back beside the front helm seat, with an ACR floating PLB (registered to me), hand-held VHF, hand-held GPS, flares, signal mirror, dye packets, etc... I have elastic tethers that keep the electronics connected to the bag (only the PLB floats on its own). Remember that a PLB must be held in ones hand and oriented properly for the antenna to work.
I'd like to replace my inflatable PFD's with units that have pockets to hold a PLB/radio this year, and add a couple of Standard Horizon hand-helds with the built in GPS to my collection.