As @Aivaras_Priudokas highlights, for the same /29 subnet to be available across all connections and multiple operators you’ll need to advertise that /29 in a way that all ISPs can route to it. However most ISPs will only accept and propagate /24 prefixes. /29 will be too small.
If you’re lucky, you can sometimes find a single ISP that will offer internal inter service routing (between their own Fiber / Cable / LTE services) using BGP. Then you can advertise that /29 from both routers on all connected services you buy from that ISP and chose which routes you’d like to prioritise (ie Fiber > Cable > LTE).
If you do that this way though you’re tied to a single ISP which is in itself a single point of failure (even when they say they are not 
) and you can’t guarantee the ISP will have multiple services everywhere you need them.
If you want multi-operator and multi-technology resilience then you’ll need to buy and advertise your own /24 block of public IPs using BGP to your connected ISPs (or get a /24 block from ISP A, request a LOA to advertise them, and pass that to ISP B). Its perhaps more complicated than it ought to be (especially finding clean IP blocks that haven’t been abused) but doable if your ISPs will accept the prefix and propagate it - not all will.
There is another option… :: puts on salesman hat :: , a service we provide at Venn Telecom. We call it our world wide access and routing platform (WARP), consisting of globally distributed SpeedFusion enabled BGP routing PoPs (or Gates) that we can use to provide you with a /29 prefix that we route over SpeedFusion VPN to your customer provided switch.
What we’re doing is buying big block of IPs, we slice them up into /24s. geo locate them in geographically redundant datacenters with multi peered internet connections, polish up their reputation where we need to, and then carve the /24s up for our customers, providing single IPs or larger prefixes as needed. I call it Network Access as a Service (NAaaS) but literally no one else likes that name
In short, you bring your own internet access methods (Fiber, Cable, LEO, 5G), we overlay resilient routing and Public IPs for you, and we can support deployments in almost any country you need it.
There is a cool video demo walkthrough of hardware failover here between a Bone 5G and a BR2 Pro using WARP:
