Modern Vespa

As I have a new Liberty 150, I ride it & my GTS full time. Wife has car she takes to work. These two beauties are my transportation.
I travel to states next door and enjoy taking alternate routes each time.
I would like to add an USB port somewhere around the dash area for phone or my Garmin. Is there a wire or wires that would be preferred to splice into for connecting the USB port?
Asking because it is easier(at least for me) to look for something going in than hunting after opening up the handlebar covers or leg shield.
I know I can get the SAE plug to the battery with an USB adapter, but I would prefer adding my own little adapter(like the GTS) with a couple Posi-Taps.

I am not a fan of wire-tap connectors because they are an irreversible intrusion into the vehicle's electrical system.

For the Liberty there is an original retrofit kit for the USB socket in the glove compartment (SKU: 1d001558):

https://www.easyparts-rollerteile.de/USB-Smartphone-Recharge-Kit-Piaggio-Liberty-IGET-2015-p27950716
(See Fitting Instructions)

https://www.af1racing.com/1D001558-OEM-Piaggio-USB-Outlet-Kit-For-Liberty---1D001558

O.S.

Thank you guys. I had already seen the kit. But $88 for a USB when I could get one for $12 was just a bit much. So I purchased the cheap one, opened the leg shield enough to mount it just the opposite of the key. Plenty of room.
Started poking around with the tester to find a wire that was hot keyed only. I'd watched Robot previously talk about Piaggio not using wire colors that made sense like red for hot and black for ground. So tapped into a wire(I forgot the color) and grounded the other lead to the frame. Plugged in the phone and GPS (it's a dual USB 3.0) and no fuses blew. Checked all lights and dash. Everything good. Put it back together and had 2 screws left over so I know I did a good job!!!!!

can i ask how did you get that panel off to get in there to hook usb up???

This is a video by Robot for changing out the turn signal pods, but this is what I went by:

https://www.youtube.com/watch?v=f3kTCOx3n60?t=1034