Use a old PC with Pfsense, Opnsense, or OpenWRT, as you can buy a MELLANOX CONNECTX-3 for like $25 on ebay, and you can get a Good AP that supports OpenWRT for like $70-$100, and a a switch for like $120 that has one 10Gb in and one 10Gb out with 4-8 2.5Gb ports. I do recommended Opnsense then you can have IPS etc. docs.opnsense.org/manual/ips.html