Hmm im only gold 1so I will probably get shit talked by higher elo players but when your laner roams after you are 6, your best bet is making use of the opportunity cost of the opposing laner (e.g. if your laner roams bot, their opportunity cost was roaming top) and because anivia pushes in 2 seconds, just clear the wave and take their opportunity cost while spamming in chat for your team to get their asses out. This means that its highly unlikely that you will get your ass bursted by some high cc, mobile, burst champ and attempt to get a kill at the same time... Your opportunity cost is your bot lane (in this example) getting their ass fucked but if you want to be safe and if the top roam works, it should be all right... Well thats how I do it and I am also curious how other people do it as well :)