Hi @oijawyuh.
I know the folks at the Securedrop Project recommend the Thinkpad T480 for all the journalists that use their software on Qubes. So I think that model in particular is well supported.
Even though it’s a bit off-topic there, it might be worth asking on their chat:
https://gitter.im/freedomofpress/securedrop
And at least to me it means a lot to know that Qubes is able to help Human Rights advocates like yourself 
(I’m not a developer, just a community member).
I made a small post a while ago that may be of interest to you: Qubes for at-risk populations.