UDT execution mode

When configuring a UDT and selecting the tag group, lets just say “5 sec update”, I notice that the setting execution mode isnt there like it is when setting just a normal tag. Can i assume it executes at that tag groups rate without specifying the execution mode?

Are you talking about the Mode on the Tag Group? or the Execution Mode on the Expression tags and Query tags? As they are two different kinds of modes.
Also on which ‘normal’ tags do you see the Execution mode listed? On the UDT where do you not see the Execution mode, are you talking about the UDT definition or the tag created inside the UDT?
Here is the documentation of different Tag Types