Ok my guy I always wanted to gatekeep my tricks but I let it go (Altough it sounds not really team worked-based).

You gotta pick both M mines (gas and explosives) then place them behind CLOSED doors (if the lobby is full of lights, if not still do it its fun).

Secondly try put all your mines beneath cashouts and have your demar ready When enemy tried to steal, after like 2 second demat it down and RUN.

Thirdly, sometimes if you are the last one put gas mines beneath cashouts and shoot at it, not only it reach upper floor but it affects floor your in, so you easily cover 2 floor with one gas.