I haven't done an investment property, but I did my primary home with them. Their rates are legit because they use NoTouch credit to shop hundreds of lenders, finding the absolute cheapest one for your scenario without a hard pull upfront.

That old laser of mine did the same wobbly line thing. Ended up just using a manual 4-foot level on the wall. Marked two spots, snapped a chalk line between them. Took maybe five extra minutes but it was actually straight. Sometimes the simple way is the one that works.