Two ISPs are not redundancy if the ISP owns the IP
A second line saves what leaves the office, not what comes in: when the main one drops, the IP address changes, and with it DNS, open sessions, tunnels and third-party allow lists. The three real ways to have two paths, with 2026 figures: EUR 1,800 a year in RIPE fees, EUR 50 for the ASN, roughly 7,700 to 10,200 dollars for the /24 itself, and the ninety-second default of the BGP hold timer.