It would help to know more about your network and your plans with these addresses. Two basic options are:
Assign /29 to internal interface of your router (as it seems you already did). It will give you 5 addresses available to machines connected to same network segment. And if you wanted to put one address somewhere else, you’d have to play with proxy arp.
Do not assign /29 in traditional way anywhere and instead route single /32 addresses to anywhere in your internal network where you want them. That would allow you to use all 8 of them.