Last year, I wrote a post on number of data files on tempdb, whether we want multiple files, then how many files should be added, what would be the recommendation. Generally, we add 1 file per core or 0.25 file per core as if number of core increases. Here is the link: How to decide the number of data files required for tempdb?
We do not need to do extra work after installation now because SQL Server 2016 installation recommends it now.
As you see, a new tab has been added and it shows number of files need to be added based on number of cores available in the machine.