So you could use one of these https://www.amazon.com/inShareplus-Mounted-Switching-Connector-Adapter/dp/B01GD4ZQRS/ref=mp_s_a_1_2_sspa?dchild=1&keywords=12vdc+power+supply&qid=1605061520&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzSzhGQUdYSkg0U1BUJmVuY3J5cHRlZElkPUEwNTEwNDgzWDRZS0NSUkVVU1pMJmVuY3J5cHRlZEFkSWQ9QTAwODkwMDAzNzlXMFNDRkxNTzFWJndpZGdldE5hbWU9c3BfcGhvbmVfc2VhcmNoX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU= But it would mean cutting the connector off of the end of your first strip light. Would allow you to plug directly into your timer, but you’d sacrifice any dimming or colour changing.
I got these. You'll need a power source too.
https://www.amazon.com/dp/B07T9L612N?psc=1&ref=ppx_yo2ov_dt_b_product_details
https://www.amazon.com/dp/B01GD4ZQRS?psc=1&ref=ppx_yo2ov_dt_b_product_details
I purchased this one -
https://www.amazon.com/dp/B01GD4ZQRS?psc=1&ref=ppx_yo2ov_dt_b_product_details
Worked well with a Lenovo M8 tablet