If you start splicing into your bike's harness, you'll start runing into multiple problems with your CanBus system as it is very sensitive to any voltage/amperage change and it will start throwing errors in.
As you own relatively new bike it wouldn' be smart to splice into wiring harness.
When I purchased my 2021 GS I only wanted to add aux lights I already had from my previous bike. I investigated various ways to wire them and was immediately warned not to splice into the harness to get the power needed for them.
That leave us with two options.
One is to put the relay that will be powered straight from the battery and use the voltage from the wiring harness (from licence plate light in your case) only to wake up the relay. The consumption of the wakeup signal for the relay is so low that CanBus won't feel it so no error will be thrown in. But still, you have to splice into wiring harness to get that wakeup signal. This option was the one I almost used as I didn't want to spend my money on something more expensive like CanSmart or EzCan (same product with different names).
The second option is CanSmart or EzCan. As I said, I didn't want to spend my money on something I didn't need as I only needed one line for my AUX lights. After a lot of thinking, I went and purchased EzCan.
Today, all of four channels on my EzCan are occupied as having those 4 channels that can do a lot of things using bike's existing switches made me upgrade things and install more power accessories.
Now I have AUX lights, one more pair of lights for High beam, Denali extra brake light and BMW 5 series car double horn. So, all 4 channels are used and if EzCan had more channels, I'd probably find something else to install.
If I went back, I would go again with EzCan (or CanSmart).
