For reference on pricing:

A very basic 5 port switch with 2.5Gbit ports - $90:

https://www.amazon.com/5-Port-Multi-Gigabit-Unmanaged-Entertainment-Network/dp/B0995S28PQ

A 16 port gigabit switch - $50:

https://www.amazon.com/Tenda-Unmanaged-Wall-Mount-Optimization-Protection/dp/B09F2T3PQ2/

A 4 port gigabit switch - $15:

https://www.amazon.com/Ethernet-Splitter-Optimization-Unmanaged-TL-SG105/dp/B00A128S24/

A *48* port gigabit switch - $100 - only slightly more than the FIVE port 2.5Gbit 5 port:

https://www.amazon.com/MokerLink-48-Gigabit-Rackmount-Unmanaged/dp/B0C53LCY65/

An eight port 2.5GBit switch - $130 - MORE than the 48 port gigabit switch, but with 1/8th the ports:

https://www.amazon.com/TRENDnet-2-5GBASE-T-Compatible-10-100-1000Mbps-TEG-S380/dp/B08XWKF55C/

Yes the topography will look like this

AT&T ONT-->Synology 6600-->(item link)-->Internal network

https://www.amazon.com/TRENDnet-2-5GBASE-T-Compatible-10-100-1000Mbps-TEG-S380/dp/B08XWKF55C

The Synology 6600 has (1) WAN 2.5gbit port and (1) 2.5gbit ethernet port.

The cable from the ONT will connect to the Synologys 2.5gbit WAN in

Run a cable from the Synologys 2.5gbit LAN out port to the 2.5gbit switch. Done

I went with one of these https://www.amazon.com/gp/product/B08XWKF55C/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

and 2 of these

https://www.amazon.com/gp/product/B0BG685PKM/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

plus the 2.5 lan i have in my main machine i will have 3. It appears that i can get usbc 2.5 adapters fairly cheap as well if i have a need.

The only bummer is i would have loved to be testing out 10Gb with my cat 5e wiring, but i think in a year or 2 i can make that upgrade.

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Thanks much for your assistance