Please for the love of god reposition your tweeter that spot is TERRIBLE like really really bad for clarity, imaging, loudness ETC basically everything.... Move them to the A pillar or Sail panel or above the midrange on the doors have them fire directly towards you on axis, if possible angle the midrange to fire at you as well. High pass filter can be anywhere from 63hz to 125hz on your head unit. Never use the amp's crossovers when your head unit can do it better.
since you are using the passive crossovers, you dont need to switch the head unit into active mode and you can use standard mode which lets you run front and rear so yes you can use that speaker. That speaker is almost pure midbass and lower midrange, you wont get anything else out of it.