Best way to tap into harness wires
 

I've bought a off brand Android based head unit for my SUV, and I'd like to add some aftermarket steering wheel controls like these:

https://www.ebay.ca/itm/10-Keys-Butt...IAAOSwtxxbWurg

What is the best way to tap in to the wires on the harnesses for the ACC, KEY1 and KEY2 lines? Should I use taps like these https://goo.gl/images/6qSSp2, or is there some better way?

Thanks in advance.