If you've read details among the article links posted above
there are a few valid items to consider. ~ And the upside to
getting something superior past today's need; most can be
be still useful in the future. Even with older or newer gear!
Your SSDs need power and data. Look up USB-C specs.
For what you've got, a few listed there; some dual duty.
(A better portable mac such as macbook/pro, even older;
has more going for it than your later build macbook 12")
Some of docks near $40-$55. are about $9 for same, from amazon.
If you are handy with tools, you may try building your own! LOL
In any event, as a fellow mac-user with 'no irons in the fire.' Given
informed choices, I'm not on commission nor selling anything; not
on anyone's payroll. Just me and my 4 old Macs at 3AM in AK!
Sometimes a call to customer support at OWC can be helpful.
Even if you aren't buying from them. ~ That's why they're good.
OWC's 10-port/12-port docks w/ extra power, etc are future-proof.
• What's the Difference Between Thunderbolt 3 and USB-C
This covers most info to discern between these port shapes.