We can give advice:
ASUS IoT 2.5″ Pico-ITX boards (100 × 72 mm) are the most compact form factor in the ASUS IoT embedded range. Designed for IoT gateways, edge computing nodes and space-critical OEM applications where minimal footprint is essential.
Contact Alptech for ASUS IoT 2.5″ Pico-ITX board specifications and availability.