[armrail:1u9ifvwh][/armrail:1u9ifvwh]
Usually people just use glue and stainless steel finishing nails driven very carefully from above, then countersunk and the holes puttied and sanded.
That’s the cheap & easy way….
Other methods include using a pocket hole at the seams then gluing and screwing from below.
[ph:1u9ifvwh][/ph:1u9ifvwh]
or…
Using Tite-Joint fasteners at the seams, then gluing and screwing from below.
[tj:1u9ifvwh][/tj:1u9ifvwh]