In one of Maharaja’s answers, he mentioned that it is not respectful to begin a letter with Hare Krishna/Haribol when it is addressed to seniors. My question is; will this be applicable when physically addressing while showing pranam i.e do we need to just show pranam and wait till the senior devotee say Hare Krishna and then respond with Hare Krishna?

Do we only offer dandavats to our diksa-guru not the other gurus or sannyasis in temple hall in front of Srila Prabhupada or the deities?