An umbrella sits on top of your other policies and picks up where their limits stop. To quote one, we need the picture underneath it: what policies you have, with whom, and at what limits. Tell us once — your answers go into the standard application (ACORD 125 + the umbrella section, ACORD 131) — and we come back with real numbers. No obligation, and no coverage is bound by this form. The declarations pages of your current policies answer most of this in one shot — the Day 0 email will tell you how to send them securely.
Additional underlying policies (3rd, 4th, 5th, 6th): for each, list type, carrier, last 4 digits of policy number, limits, and effective-expiration dates