An interesting alternative to buying the equipment is leasing, which will allow you to rent iPads over a 2 or 3-year period, for a monthly fee. This can be a great option to smoothen the investment out over several months. Prices vary according to your region and context, but leasing iPads Pro 12.9" over 36 months can range from 20€ to 30€ ex VAT per month. Again, Apple Business Team representatives will help you out exploring this option.
If you only require iPads for a one-off event or a short duration, renting the equipment will most likely be the best option. We have a network of iPad rental companies, some of them even supplying Bluetooth foot pedals.
All the resources can be found via this article.