Rights issue - NSDL, CDSL holdings plus secondary purchase

Say I have below LT Finance holdings (not right issue) :
ICICI Direct : 74 (= 17 RE)
Zerodha: 74 (= 17 RE)

Also, I bought 5 shares of L&T Finance Right issue in secondary market in Zerodha

Now, above being the holdings, how many L&T fin REs I can apply for ? Is it 17+17+5 = 39 ?
What is the quickest/easiest way to apply for?
Is it possible to apply for only in one place ?