Power Alarm Base station using a Step Down DC converter from my RV's 12 volt system

I would like to use a device such as this ([LINK](https://www.amazon.com/dp/B00C0KL1OM/ref=sspa_dk_detail_2?pd_rd_i=B00C0KL1OM&pd_rd_w=L8AaU&pf_rd_p=57cbdc41-b731-4e3d-aca7-49078b13a07b&pd_rd_wg=cLdOO&pf_rd_r=HD55FHG1X559Y09M9PBH&pd_rd_r=2c3d3917-5f76-4f2a-920b-bd866088f2c2&s=aht&smid=AFHAE9RJVUMB&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzSElHNkY3UExET1FBJmVuY3J5cHRlZElkPUEwNzk4NTI3MjRSQ1RUTEFRQ1ZONCZlbmNyeXB0ZWRBZElkPUEwNzgwMTgyMUc4NTZTSUdPVzJPViZ3aWRnZXROYW1lPXNwX2RldGFpbF90aGVtYXRpYyZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU&th=1)) to power my Ring Alarm base station in my RV. We often boondock and only have 12 volt power. Does anyone have any experience or advice on how to complete this task?