I was able to carry out a search and unfortunately we do not currently have the desired length in our range. Furthermore, I have checked a procurement and unfortunately we do not currently have a corresponding purchase offer for the desired length, so unfortunately it is not foreseeable if and when we could offer it.

The Ubiquiti UACC-DAC-SFP10-0.5M cable is suitable for connecting a UDM Pro to a Ubiquiti UniFi US-24 switch. - The cable is an SFP+ compatible direct attach cable that enables a connection between two SFP+ ports. - It supports a throughput of 10 Gbps, which is sufficient for the connection between network devices such as the UDM Pro and the UniFi US-24 Switch. This cable is perfect for short connections between switches and other network components in the rack.

Hmm, first we need to know exactly which model it is. But I'm going to assume it's the Internet Box 3. Because it has an SFP+ connection. However, this is now for the WAN side and not for your home network, which makes the DAC obsolete. In addition, it won't help anyway, as the router doesn't have 2x 10Gbit connections and you won't get 10Gbit anywhere through the box. If you really want fast data transfer within your network, you need to hang other/better hardware in front of the router. For example, hang a Dream Machine in front of it and then 10Gbit switches or you probably don't need this on all devices, then a 2.5Gbit switch is probably not a bad choice either.