I'm applying to the US and Canada for PhDs this cycle, my undergraduate university is very well regarded in my country (UK) and generally in the top 5 for domestic rankings/prestige. Even more so for my undergrad program (Physics), which generally accepts people who very narrowly missed out on Oxford/Cambridge places. However is pretty much unheard of outside of Britain (ranked in the 60s/70s globally). Do I ask my referees to make the relative prestige of my uni clear on my LOR - so that admissions tutors can understand the context of my grades and experiences?? Or would this be considered too on the nose?

I am preparing to send of materials to all of my referees with some advice on how to write LORs for north american applications, which they may not have done before - so I would really like to clarify this before I do so.

thanks in advance !