If you ever look at the wing of a full scale airplane you will see that the flaps are always on the root (closest to the fuselage) of the wing. This is because if you ever induce a stall in the wing (loss of lift) you want it where there is the least amount of lever action.

Think of a sea/saw and how how hard it is to push it down if you push near the center vs pushing near the end. If you stall the root of the wing, the plane rolls gently to one side. If you stall the tip, you are flying knife edge before you know it.

I love flaps, have installed them on many planes by shortening the strip ailerons (ailerons are least effective near the root for the same reasons, and usually start with 10-20 deg down flap and manually pushing in down elevator to get a feel for where the elevator needs to be for that amount of flap. With the plane on the ground, I then set up the flap/elevator mixing based upon the down deflection I needed to add in my test flight. Back in the air, two mistakes high, I test my setting.

Flaps that deflect up are called spoilers, but I have never seen a model that needed them.