Is anyone running XenForo on an InMotion shared server?

I'm having trouble installing XenForo on my InMotion shared account ("Power" Plan).  I keep getting a fatal error in one of the php files during installation.  I've tried changing to different PHP versions (both up and down) in cPanel and that doesn't solve it.  InMotion tech help has been trying to assist me but they finally gave up and told me that XenForo is simply not compatible with NGINX.  I find this confusing because over on the XenForo forums lots of folks say they are running XenForo on NGINX servers.  He further suggested I would have to either upgrade to VPS or choose one of the free forums available in Softaculous LOL.  Did the tech just give up too early and try to shoo me away?

My quetion to this forum is, is anyone else running a XenForo forum here on InMotion?  On one of the shared server accounts?  With NGINX?  Or if anyone has any advice for things I can try to resolve this issue and complete the installation, please let me know.

Thanks!