Questions about speakers on rear deck

I have a 97 corolla and want to replace the rear speakers. The rear speakers are 6.5". When I look at the rear deck from inside the trunk there are four spots in the metal frame. The current speakers occupy the far left and far right slots. The two in the middle look like the could fit 6x9 speakers. There aren't holes for two more speakers in the deck material but I figure that it wouldnt be to hard to cut out. I want to put 2 6x9 speakers in and replace the current speakers with 6.5" subs.

Im new to car audio and wanted to know if this amp would be good for these subs.