BSM 9.26 HA with two boxes

Hi all, 

We 'd like upgrade our BSM environment, currently, we have BSM 9.26 (EUM and baseline)  distributed instllation (1GW and 1DPS)  but we dont have HA.

We'd like to upagrage it to HA, but we have restriction to add more boxes, therefore, I was thinking in what posibilities we have and which is the best one. Could you advise here ? 

1. Unistall and Install two singles installation. 1 BSM (GW DPS) in each machine, joined by a LoadBalancer.

2. Install the missed component in every machine, DPS in gw box and GW in dps box.

I'm investigating these two options to have the minimal outage possible (system down). 

Regards