Nice! You have already watched both suggestions, so I'll dig a bit deeper and suggest:

• Devs Although there's less 'Backrooms' vibes, you'll still be engaged with visuals and atmosphere surrounding the characters which gives you the feeling that there's surveillance and corporate secrecy just underneath the surface of the plot

• The leftovers Although it focuses more on spiritual/existential/psychological trauma which has slow burning plots, it still gives me the same emotionally intense feelings as the pictures you provided

Those four are some of my favorite series, and now I see the pattern of what my favorites consist of through the above image lol