Wi-Fi dead zones are rarely a surprise. They are built into the building long before an access point is mounted, in the walls, racking, shelving and materials a floor plan never shows.
A site survey walks the space with measuring tools before anyone drills a hole. Signal is tested where people and devices will actually work, at the height they will work, and through the obstacles that sit between them and the access point. The map that comes out is of the real building, not the drawing of it.
Materials decide more than distance does. Metal racking, concrete, refrigeration, glass and dense storage all bend or block a signal in different ways, and two rooms the same size can behave nothing alike. A corridor that tests well empty may change completely once it is stocked, staffed and busy.
Mounting access points first and surveying later is just installing the dead zones permanently.
The survey settles the decisions that are expensive to revisit: how many access points are needed, where they belong, where cable must run to reach them, and which areas need special attention. Moving a point on paper costs nothing. Moving it after the ceiling work is done is another visit, another lift and another interruption.
KSPACE TECHNOLOGIES treats the survey as the first stage of network installation work, so placement, cabling and coverage are agreed from measurements before installation begins.
Takeaway: survey first, mount second. If you have not measured the building, you are not planning coverage. You are hoping for it.