As to mounting the module, I would say it's meant to mount by machine screws or other small bolts - maybe to standoffs on the circuit board - mine certainly has holes in each corner.
I think my final product will use a commercial bezel. I see now that digikey has the "Proud" products and there's one that looks perfect for the 8X2 displays
I just measured a 2x16 display I have. The bezel is 71.4x27mm.
They can be mounted this way, as shown in the picture: