Martinez consistently plays 1-3-4-2-1 with two offensive midfielders operating in the offensive third and leaving wings for wing-backs, but in the attacking phase Belgium looks more like 1-3-4-3.
Belgium is not high-pressing and maintains 1-3-4-2-1 shape. They wait for the opponent to enter the midle third and then increase the pressure to be sure that the center defenders secure space behind the wing-backs who support the second line.
In the deeper defence the formation looks like 1-5-2-3 with the three center-backs holding a narrow low to middle block and the wing-backs who are responsible for the pressure on the flanks.
In the transition phase they initially try to fast regain the ball, but when it fails they regroup rather quickly and desist from high pressing.
In the positional attack they build actions from the central-backs and although two central midfielders play a key role here they clearly prefer the right side to develop offensive actions. Central midfielders play the role of pivots rather than playmakers and their main task is to deliver the ball forward and create deeper passing options. They rarely move higher into the offensive third.
Just ahead of these two are two playmakers who play outside of the half-space and roam in the offensive third to find free spaces and create opportunities for the last pass or shot.