Subadvisor Overlay Management - Advice

I’m interviewing for a company that has considerable AUM (>$20B) and the role I’m interviewing for is Portfolio Manager in the overlay group. Basically focuses on adding after-tax alpha through tax and implementation trading strategies. My question is this: is this too narrow, meaning will I risk being pigeon-holed down the road with this type of experience? What do the fundamental analysts out there think of overlay management in general? Is it respected? Thanks in advance.