The basic rule I use is 500m RVR and the ability to meet the published net flight path, with a 30-minute diversion that that has to be above IFR minimums.
Other factors include a requirement for centreline runway lighting and edge lighting, currency, accurate RVR readings and an appropriate aircraft loading.
In LVO - I aim critically for 200’ agl with a quick clean up of the gear on achieving positive rate on IVSI and climbing at VY (or VYSE) taking into account gyro precession.
I have only departed under LVO about half a dozen times and bar one occasion when I broke out on top at FL100+ every other time the tops were < 1000’.
Generally - I try to avoid these sorts of departures and wait for the weather to clear.
PA 23 250 Aztec