I noticed that, on your first picture. You'll have a good view of exactly where the point is starting to dig.
The only problem I see with the side mount, and I'm not sure how valid the concern is, is that you might be able to twist the loader arms if the auger bites hard under a rock or tree root. The trouble with mounting it on the center line of the bucket is the hood obscuring your view of the auger.
I doubt it'll pull hard enough to twist the loader permanently unless you held the valve open and let it pull the end of the bucket down. One way to reduce the risk is to adjust the remote pressure relief to a low enough value that it will stall the auger before it can damage the loader. You could set it quite low to begin with and see how well it digs, if it's too lazy simply increase the pressure setting until it works well.
Nice job overall, it makes me wish I'd gone that way too. I found an older Kubota-branded 3 point auger instead. I have my fence built now, so most of my use will be simple repair and reboring existing holes.
Sean