Are you using the domes at night outside, if so they will not work very well, there are a significant number of post of problems with dirt and IR and light reflections.
Go with a turret camera.
What do you want to do with the cameras? where will they be mounted ?
Why do you need 4k, 4K cameras are crap at night unless you have a lot of light.
If the cameras are outside and will be used at night go with ....
Use Dahua starlight cameras or Hikvision darkfighter cameras or ICPT Night eye cameras (
https://store.ipcamtalk.com/) if you need good low light cameras.
I would go with a dahua system from andy. He is the goto dahua supplier for the forum. He has excellent service. Contact him via email
[email protected]
He has two stores one on amazon and one on aliexpress. He has more products then on his stores.
Buy Products Online from China Wholesalers at Aliexpress.com
Kingsecurity2018 @ Amazon.com: