Network Multipath Routing

Hello,

how to setup persistent network multipath routing in RHEL 7.x (surviving reboot)?

ie ->

eno1 - mgmt
eno2, eno3 - real traffic

ip route add table 88 default nexthop via eno2_GW_IPv4 dev eno2 weight 10 nexthop via eno3_GW_IPv4 dev eno3 weight 10

that works fine when typed through cli, but can't find any info how to setup those in /../network-scripts/* files, any advice ?
Following that - how to expand that defined route so when one of two devices is down (ie `nmcli connection down eno2) traffic still goes through the other one (eno3)?
MGMT interface (eno1) is mentioned here to emphasise that source policy routing is used for management traffic.

TIA,