You should charge heavier up front but doable for your target market which should include a support package throughout the year. Problem with early stage B2B SaS is their founders know all sales processes are important but have no time to set them up and upkeep them. Sales team members in these companies aren't being audited and want to set up enough to automate results but not enough to show the owners where they're underperforming. Given this, if you're talking to an owner, give them a very simple intake process to onboard what is important to them and how to take tasks off their plate. If you're talking to the sales team, start small with what you can deliver to them incrementally but understand what is incentiving them specifically outside of sales (e.g if they want streamline their cold calling processes, serve website leads quicker, etc) to then push you to decision makers if it isn't them. Think it's doable, just need to know your target market well.