The Stacking Cables on the traditional Meraki switches (i.e. not the MS390) are QSFP-based 40Gbps Cables. The Twinax cables in your first link are 10Gbps SFP+ cables and can't be used for the stack ports.
The Stacking Cables on the traditional Meraki switches (i.e. not the MS390) are QSFP-based 40Gbps Cables. The Twinax cables in your first link are 10Gbps SFP+ cables and can't be used for the stack ports.