set interfaces lo0 unit 1 family inet address 10.0.0.1/24

set interfaces reth2 unit 1150 vlan-id 1150
set interfaces reth2 unit 1150 family inet unnumbered-address lo0.1

set interfaces reth2 unit 1151 vlan-id 1151
set interfaces reth2 unit 1151 family inet unnumbered-address lo0.1

set routing-options static route 10.0.0.2/32 qualified-next-hop reth2.1150
set routing-options static route 10.0.0.3/32 qualified-next-hop reth2.1151

set security nat proxy-arp interface reth2.1150 address 10.0.0.0/24 (tried setting 10.0.0.3/32 here)
set security nat proxy-arp interface reth2.1151 address 10.0.0.0/24 (tried setting 10.0.0.2/32 here)