Thanks. Do I have to use multiple vias for 5A ?Laying out circuit boards is like a puzzle. You want to position components to permit short, direct paths as much as possible.
High current paths are the most important, which in this case is the high power connections between the MOSFETs and the power connector. Ideally, they will be located adjacent to each other with short connections.
The other place short connections are best is the bypass cap for the chip. As close to the power pins as possible is the goal.
You can use both sides of the board to route tracks with vias connecting top to bottom. The soldermask will insulate the board from the metal trim. You might add a thin layer of insulation, like a piece of overhead transparency material, to be safe. Bit no through-hole components in this design.