After soldering the Kickstart-adapter I could install the TF534. On the adapter I have KS 3.1.4 and KS1.3 with SCSI extension from Aminet.
The KS3.1.4 works 100%. I could get the WB1.3 to autoboot but with hickups. I could not yet identify the problem but the boot process is halted frequently. I can get it to proceed by pressing a key on the keyboard! Weird. But with the Workbench loaded the machine will freeze after a while.
With AutoAddRAM from Aminet I can add the 4MB of the TF534 at 40000000 to 40400000. Under WB3.1.4 it is added automatically.
So far I am satisfied with this cheap accelerator.