Looks like it comes with bases. A 0 moa base on a flat shooting rifle will usually take you way out there if the scope has a fair amount of adjustment. Maybe need nothing.
They have their pluses and minuses. One thing I like is that they just make it a whole lot harder to end up with rings too low and even if the scope ends up at exactly the same height as it would with two piece mounts I like the sight lines better.
Or course, the once piece adds strength and stability that no two piece system can to your action.
Just make dead sure when you mount a one piece rail the fit is perfect because if it isn't you will be inducing a slight bit of torque, twist, or bend to your action.
When I install them I match them up perfectly and if there's even the slightest misalignment in height I'll break out the dremel and work on it till I have full contact on both ends as close to perfect as possible.
From there I use a slight amount of bedding compound being careful to keep clear of the screws and screw holes then snug it up just enough to eliminate all movement.
Once fully set, torque to spec.
On big boomers with a heavy scope from there it's not a bad idea at all to have a gunsmith drill and pin the rail to the action with at least a single pin in one end if not both.
I never realized just how unacceptable those tiny little number 6 and 8 mounting bolts/screws are to shearing forces until a couple of decades ago.
One of our engineers here explained it to me and I don't remember the full explanation but the threading of the screw costs you about 2/3 or 3/4 of it's resistance to shearing forces as compared to a straight pin of equal diameter.