Hello guys

Trying to get some feedback on which direction to upgrade current Bose System. I was planning to just add boxed sub with a JL XD amp then thought it might be nice to add some nice speakers on the rear deck as well to bring more detail and life into the music.

the amp I was looking at was the JL Audio XD1000/5v2. 5 channel amp and has enough power for the boxed sub. The 6x9’s I was looking to add are
JL Audio C2-690tx


Questions
Can 6x9’s be added securely onto the deck on each side. Removal of the factory sub as well. Has anyone added speakers other than subs on the rear deck?

For amp input by , would tapping into the wires coming out of the bose oem amp be the correct approach and which ones would I tap into?

Since i would bridge the left and right channels to power the 6x9’s would, I need to provide all 4 inputs plus a sub input?

thanks in advance and appreciate any feedback