I'm wondering if anyone has any information on doing this
The internet tells me I can make a piezo for an acoustic but I want to mount one under the bridge of my electric
You don't put the piezo under the bridge on an electric, the piezo's are in the saddles themselves.
Graphtech sell a piezo loaded TonePro's wraparound bridge, which is probably the best wraparound bridge you can buy. It isn't cheap, but mounting a piezo under the bridge will sound quite weak and is not ideal for an electric.
You also need a preamp with the bridge too, otherwise the piezo signal is extremely weak.