We 4 adults will be traveling by road from Bangkok to Siem Reap by road in Dec. I have looked through different posts and the border crossing procedure, as I understand it, is summarised below. Given we will have an E-Visa with us does the procedure on the Cambodian side change in any way?
"Find the border crossing at the end of the round-about. It's to the right side of the main market.
When the taxi drops you off at the border, you will need to walk to the Thai immigration office which is on the left hand side of the road to get an exit stamp.
Once through Thai immigration keep to the left side of the road, walk over the bridge and past the casinos. You will encounter a stand where you may or may not need to fill in a health declaration form. Once this is done cross the road.
Proceed to Cambodia immigration (it is like a small shed on the right hand side) you will pass another casino on the way. You will need to fill in a Cambodian arrival card when you enter the shed then go through immigration.
Outside Cambodian Immigration there is a Bus which will take you to a Transport Centre where there are taxis"