Bought the Eton kit from Hasler but I really do not like to cut the original wiring.
So I bought the Focal kit aswell to use as tweeters from there and speakers in the doors and might use the Eton main speakers in the rear.
Will the head unit take it?
The headunit has a max output and will never exceed it.
If your speakers can handle more you will never be able to use the full potential of your speakers.
In that case you would need to add an amplifier.
I would also add an equaliser (as has been suggested before by
@MagnusT ) .
Toyota makes a tuning for each vehicle specific, this tuning is made with the standard speakers. So if you would put a headunit of the C-HR in the GRY it would sound completely different.
The cars that have the JBL system have a tuning in the amplifier and a flat EQ with low output on the headunit.