I used a 12" extension, 6" extension, 3/8 swivel head, and long hex extension that is always recommended. I also ended up using a stubby wrench and small hex bit. Oh, and a jack and jack stand to get the car off the ground and the passenger front wheel off.
For two of the bolts, pretty sure I could have gotten them with the stubby. But I only used stubby on the bottom left one. The top left I was able to get the hex extension head in, set it, then started added adapters/swivel head as needed until I could connect the ratchet and start turning.
The bolt on the right side (if you are looking from the passenger wheel well) is hard to even see. I used my fingers to guide in the head of the hex extension, and once again started adding pieces until I was to the brake rotor where I could connect the ratchet. I usually kept my fingers on the bolt head so I could be sure it was turning and I wasn't stripping it.
A little easier going in. Try to hand screw in the easiest to reach bolt (for me was top left) to get the piece hung. Then hand insert the bottom left. Then do the same process you used to loosen them to tighten them down. Then hit the right side one. After that, I went back to the other two just to be sure they were still tight. The bolts supplied with the DV+ seem a little less soft and better cut, so they really took the hex heads well. Note that the heads will stick out a little bit even when completely tightened. The stock ones were about flush. But tight is tight, so pretty sure I'm good.