We can give advice:
ASRock Industrial Micro-ATX motherboards (244 × 244 mm) combine a compact footprint with solid PCIe expansion capability. Up to 4 expansion slots in a smaller-than-ATX form factor – ideal for industrial PC builds where a full ATX board is too large but more slots than Mini-ITX are required.
Request a quote from Alptech for ASRock Industrial Micro-ATX motherboard specifications.