i dont like that set up at all. its not going to work very well for you.
first, do you know if that is the OEM swingarm? doesnt look like it from the pics, but its hard to tell.
the chain tensioner is going to work right in that position. for two reason. the first, that tensioner is going to wear down so fast. and, since its holding the chain in the up position, its going to wiggle back and forth while riding, the chain will be unstable, and might come off of the sprockets. second, it cant do its job like that. when the rear shock compresses on a bump, the total distance that the chain needs to be is shorter. the idea of the chain tensioner is it pushes the chain down when the rear sprocket goes up, keeping a near constant equal tension on it. there should be a chain guide on the bottom of the swing arm to guide the chain as it leaves the rear sprocket, and a chain slider on the top of the swingarm, near where it bolts to the frame, that guids the chain, and keeps it off of the metal swimarm the the shock compresses. i have tried to draw some quick diagrams in paint, incase you didnt understand what i am trying to explain.
does this make sense? if not, let me know, and ill try to explain it in a different way? but the way the geometrics of the whole system works, i am afraid the chain will jump off the sprockets with its current setup