Being the only support , should I ward top and bot lanes at the same time?

I'm not sure where to ward when I end up being the only support in my team. I usually buy them at the start and every time I can after that, only putting them in my lane, both on the rune (top or bot) and the jungle, or both at the same time if I can.

After I give one ward to anyone going the opposite lane, should I roam to that lane to ward? should I get one and put one on the courier? should I tp just to ward?

I feel like most of them are making me lose time in laning, and the courier option is complicated to remember and communicate in a pub. Is it neccessary to make the effort? or should a team survive the laning phase with only 1 lane properly warded and the other warded from time to time?