Cache and app server configs?

codeplex
sharepoint2016

#1
Do I have to add the information to the configs like I do on the WFE?

#2
You have to add them anywhere that would access the fba user database - usually just the WFE's should do it - but I will usually make the entry on ALL SharePoint servers. Easier to do that all at once than to try and figure out why something isn't working 6 months in the future.