Good luck dealing with them... They are useless most of the time and will ignore you until you have gained some paralegal experience first. However, I had a good experience with DA Solutions/Law Support Group. Nick was really helpful and helped me secure a role in a few weeks. They may be able to get you a very short-term role (like a 2-week position) and you can then use that experience to secure a better role. Ryder Reid were alright too, although they failed to communicate the result of a final interview to me and had to find out the negative outcome by seeing the ad reposted online.
I would suggest sending messages to recruiters on LinkedIn highlighting your background/skills and what type of role you are looking for, location, area of law etc. This is how I was put in contact with the Law Support Group and secured my first role. I wish I had it sooner as it would have saved me wasting so much time!