If you are two weeks to harvest, the chemicals you can use are limited. The plant will show obvious signs of mites after harvest BTW, so this reduces its value.
This rule is best - IF you cannot dip the ENTIRE plant into a bucket of solution to wash it - you are taking a big risk. When I get clones, or small plants - I dip them.
When a large plant is infected - you best get rid of it before it breeds more mites into your space.
Spraying is not going to cover all the areas. You need to attack not just mites, but their eggs.
I used a two stage bomb - Pyrithrin and Allude, which contains
Piperonyl Butoxide . This stuff is strong, but if you use it in veg or early flower it is GTG.
The mites can smell the pyrithrin as an attack, and they will start laying eggs like crazy! after two to three days, you light off the second bomb - Allude/Piperopnyl butoxide.
They offer a third bomb, but I used it after the room was emptied.
Plants that you get in the future you might want to inoculate with Azamax, it has other stuff than neem oil. Any future mites will bite into the inoculated plant and hate it.
Mites seek out plants that are stressed, so you might have other room issues like temp and humidity.