Is there any other tool other than 'Modz' to change Z levels in AECOsim while moving 3D elements ?
ModZ is a third party MDL that would need to be recompiled for CONNECT Edition.
In both V8i and CONNECT Edition we have the 'Align Elements by Edge' tool, press F4 to search the ribbon for it location(s).
Assuming that there is at least one element at Z=0:
this will not work in isometric or rotated views.