I recently bought a 2x2 plasma table and it came with electronics.
Here is a list of the electronics i received with my table:
(4) nema P# 57BYGH310
Arduino clone board
CNC shield
(4) DRV8825 drivers
12v though 24 volt power supply
dual relay board

Questions:

1) I was told to use Grbl software as the controller but I would really like to use Mach3 as my controller. So would something like this: CNC USB Controller UC100 for Mach3 CNC Controller USB to Parallel | eBay
Work so I could run Mach3?

2) My table has a floating Z axis but I'd like add a torch height controller . Would something like this work for my current setup Spare Parts : Low Cost Torch Height Controler ?

Thanks!