You can not mount a red dot to the top of the Spuhr ISMS 34mm Rifle Scope Ring Mount.
The Spuhr ISMS 34mm Rifle Scope Ring Mount will fit the NightForce ATACR 7-35x56mm F1/FFP Rifle Scope and mount to the picatinny rail base on the Delta 5 Pro. However, I recommend using the 28mm or 34mm high Spuhr ISMS 34mm Rifle Scope Mount at the link below to allow enough clearance for the objective lens.
https://www.opticsplanet.com/spuhr-34mm-riflescope-mount.html?_iv_ring-height=28-mm,30-mm
No it will not. You will need tube size of 34mm but of High height rings.
Recommend emailing us at techsales@opticsplanet.com to help you further.
You would need rings that are 34 mm and also High on height
These would be too low for that setup, you would need these instead: https://www.opticsplanet.com/spuhr-34mm-separated-rings-riflescope-mount-for-picatinny-rail.html
Yes, these should work for your setup.