What is a good solo ad conversion rate?

Hi all,

I am thinking about buying solo ads for traffic to a landing page, that then promotes a WordPress plugin. Of course I know that the generated leads (in my case active installs) will depend a lot on the email copy, the landing page, the plugin itself, etc.

Still I would like to know from some experienced solo ad buyers, what a good conversion rate for a landing page would be, that promote the following:

- What is a good conversion rate for a landing page promoting a free WordPress plugin (without email opt-in, just active installs)
- What is a good conversion rate for a landing page promoting a free software (with email opt-in and software as opt-in bribe)
- What is a good conversion rate for a landing page promoting a free e-book (with email opt-in and e-book as opt-in bribe)

I heard everything from 1% to 50%, but would like to hear REAL numbers, from someone using udimi or other solo ad marketplaces.

Thanks & Cheers
Michael