Nowadays only bot on an account you are willing to risk.. Jagex has been cracking down on botting recently... honestly depends on what skill your botting, are you monitoring it, and player reports... just test the waters with multiple accounts.
Max accounts can go up to 2k-2.5k with almost everything complete.. seeing as you don’t have all diaries.. I’d say atleast 1.6-1.8k
I wouldn’t settle for anything below 1k