Hi.......The screw is only experiencing end forces as it tries to push back or forth in the nut so that will mean you only need to have thrust bearings to resist the screw movement.
Any radial moves are contained in the nut which will always centralise the screw in it.
The screw will not revolve fast enough to need any radial restraint from whipping........a milling machine is a different matter as the axis screws can whip if it's not prevented from whipping up and down under fast traverse conditions.
You will need a shoulder in the housing for the bearings to press against from either side........seals are a very big necessary too.........angular contacts can come complete with seals, but the housing design will be different for both types of bearing.
Ian.