Utilize Amazon Kinesis data streams categorized by quote type, with the web app directing messages appropriately and backend servers using KCL to process their respective streams.

Implement AWS Lambda functions and corresponding Amazon SNS topics for each quote type, with the Lambda functions subscribed to the relevant SNS topics and the app publishing quote requests to the correct topics.

Use a unified Amazon SNS topic with Amazon SQS queues subscribed to it, applying SNS message filtering to route messages to the correct queue based on quote type, and configure backend servers with individual SQS queues.

Establish Amazon Kinesis Data Firehose delivery streams for each quote type, directing them to an Amazon OpenSearch Service cluster, with the application sending messages to the corresponding stream and backend servers searching and processing messages from OpenSearch Service.